Improvement in permutation-locks



OLIVER E. BILLARD, CE NEW BRITAIN, CONNECTICUT, ASSIGNORTC FRED ERICK H VNCRTH, CF SAME PLACE.

Letters Patent No. 97,550, fla-ted December 7, 1869.

IMPROVEMENT IN PERMITTATION-LOCKS.

The Schedule referred to :in these Ilettexs Patent and making part o'f the same.

To all whom it may concern Be it known that I, OLIVER E. BILLARD, of New Britain, in the county of Hartford, and-State of Connecticut, have invented a new and useful Improvement in Combination-Locks; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in

which- Figure l is a side elevation of' my invention, the cap-plate being removed.

n Figure 2` is a side elevation of the latch, viewed from the backside.

Figure 3 is an edge view of the exterior parts, viewed from the under side.

Figure 4 is a side elevation of the shaft for operating the lock.

Similar letters of reference indicate like parts.

My invention consists in the peculiar arrangement of the latch with the tumbler-s, so that thelatterY shall not rotate `as the bolt is moved.

A designates the case or shell.

B designates the latch. The back side is provided with a longitudinal recess, a, in which is .fitted the I slide C.

Slide Cis vprovided with an arm, b, and pin c.

The position of the slide C and pin c, in iig. l, is indicated by broken lines.

LatclrB is also provided with an arm, d, and is pivoted directly to the case A, and in front of the bolt D.v

The pin c extends into the slot e, in the bolt D, which slot allows the pin to play vertically, so that the latch B and slide C maybe raised when desired, but as the bolt D is moved, the .pin moves the slidel C laterally, while the latch B remains 'motionless.

To the shaft E there is attached a gear, F, meshing into intermediate gear Gr, which meshes into another gear, under and secured to the throwingdisklri.

The arm l), of the slide C, when the lock is unlocked, rests in a slot in disk H.

By turning the shaft E, the bolt D can thus be Jfhrown ont and in.

Four tumblers, with a slot in the periphery of each, are placed one in front of the other, and all in front of the disk II; .but to better show the disk, the tumblers are not shown, while their outlines are traced in the broken lines I.

As the, latch B liever moves laterally, and the arm d rests in the slot in the tumble-rs I, the tumblers can'- not revolve while the bolt D is being thrown.

The red lines in fig. l indicate the position of the parts with the bolt D thrown outward.

'lo lock the device, the `shaft E is rotated quickly, so as to throw the bolt out with considerable force, when the arm b will raise ont of the 'slot in the disk H, and rest on the periphery of the samewhich will cause the latch B to raise with its end immediately back of the stud g, on the bolt D.

In any attempt to slide the bolt back by pressure on its end, it will be seen that the arrangement of the latch B is such that all of the strain is exerted on the case A and stud g, one of' which must'fail before the bolt can be driven back by pressure on its end.

By bringing the slots in the tumblers I all at the same time under the arm d, the latch B will fall, and allow l the bolt D to withdraw.

On the inside of the lock, I insertv three or more screws, l, which screws are of such length asv to extend, when desired, to the outside of the lock. (See ilf. 3.)

'DIhe object of the screws i. is to provide a cheap and convenient way to draw the hub L rmly into the door to which the lock is to beattached.

A tapering hole is made in the door, to correspond with the shape of the hub L, and should t 'the hub L so snugly that the effect of blows, ol' pressure on the end of ,shaft or hub, will be received by the door instead of the lock;

Simply ,placing the hub in the door is an oldldevice, but such a t as is desirable is not always easily secured. y

The hub L is unscrewed from the lock and passed through the hole in the door, and then again screwed into the lock, which is placed on the back side of the door.

The screwsi are then extended until the hub L v snugly lits the hole through the door. The lock can then be secured by bolts, while the hub L remains properly fitted in place.

The shaft E is provided with two tapering shoulders,m m.

The bearing in the hub L, indicated by broken lines, lig. 3, is of a shape to-iit the inside shoulder m.

The shaft E is partially cut into, 'so that on breaking the same, it will break outside of both shoulders The expert, in look-picking, will then attempt or desire to remove the shaft by drilling it out, but as it freely revolves, 11e must secure it firmlyy inits 'place before he can succeed in drilling it.

By-making the inside shoulder m' tapering, blows on the end of the 'shaft will not upset the same, or destroy the freedomwith which Ait revolves.

The outside shoulder being tapering, it will also be much more dicult to prevent-the rotation of the shaft by upsetting the end with a cold-chisel or otherwise, than it would be if the shoulder were square.

The latch B and slide C are .the only new elements of this invention.

What I claim as new, and desire to secure by Letters Patent, is

Ihey latch B, when secured to the case A, and provided with the slide C, arranged to slide -longitudinally with the same, substantially asdescribed.

OLIVER E. BILLARD.

Witnesses: Y

JAMES SHEPARD, J. HENRY HART. 

